Scale



B. w. KING SCALE Feb. 15,1927.

Filed July 51, .1924 5 Sheets-Sheet 1 INVENTOR. Zerz may 22M 5 ATTORNEY.I

-B. W. KING Feb. 15 1927.

SCALE Filed July 51, 1924 5 Sheets -Sheet 2 I N VEN TOR. Bert M g ATTORNEY.

B. 'W. KING SCALE File'd Jfily 31, 1924 s sheets-sheet 5 INVENTOR.

ATTORNEY.

B. W. KING Feb. 15, 1927.-

S GALE Filed July 51. 1924 5 sheets sheet 4 I N V EN TOR Ben M MyATTORNEY.

Feb. 15,1927. 1,617,851

I B. w. KING SCALE Filed July 31, 1924 5 Sheets-Sheet 5 IN VEN TOR.

A TTORNE Y.

' Patented Feb. 15, 1927.

-UNI TE'D sryrla s PATENT OFFICE.

W. KING OF DETROIT, MICHIGAN ASSIGNOR,TO BARNES SCALE COMPANY, OF

DE'I-BOIT, MICHIGAN, A CORPORATION OF MICHIGAN.

SCALE.

Application filed July 31,

This invention relates to pendulum scales,

It involves a novel organization of levers of the first order inconnection with double knife edge pivots. It is not broadly new to use alever system in which the main slevers are of the first order,especially in a platform scale, but it is believed that the use of,levers of the first order in connection with a counterweight attached toone of them-has never been found practical.

7 "There :is a tendency for the counterweight to shift or lift the leverfulcrum from its support. This trouble has been overcome .in the presentlever system by provision of means to prevent this action.

Another feature of this improvement is the employmentof an extracapacity weight and special means by which the same may be applied tothe counterweighted lever. The device to increase the capacity of thescale here is another feature which will be more fully describedhereinafter.

In the drawings: r

'F'g. 1 is a perspective of the scale.

Fig. 2'is aplan view of the lever system. "Fig. 3 is a side elevation ofthelever sys tern. Y

Fig. i is' a'section on the line H of Fig.6 is a section on the line 5-5of Fi 2. '6 isa section on the "line 66 of Fig.1. Thescale is providedwith the usual base housing v,(t'andthe upright housing I), the

'Tlatter of which houses a pendulum 0, the

eccentric cl and the tape 6. However, these features are no part of theinvention,which resides inthe lever system. The usual dial'isflprovided, over which oscillates the in- P dicfator fh'and g.

-A platform It is supported on a saddle i. This saddle vis secured byscrews j to two platform supporting bars this forms a sort of H platformsupporting frame with the-saddlelocated in theopening n in the top ofthehousing a. The platform is pro- ;vided with a depending ellipticalcup '0 1 50, which-can'fit over this saddle, as will be seen froinFig;3; Theplatform frame is in'the form ofia sort of'igrid r in which reststhe 1924. Serial No. 729,212.

platform slab of glass 9. This grid 0 is secured to the plunger rods ofthe dash pot t. j

The lever system comprises a counter-- weighted lever u of the firstorder, being provided with knives i) which are supported in the agateblocks :0. The load is applied to the lever u by the agate blocks y onthe bottom of the platformsupporting bars engaging the knife edges 2.The other lever of the first order is designated 1 and is fulcrumed bythe knife edges 2, in the agate bearings 3, supported in the inverted Lblocks 4. Both of these levers are in general configuration T shape.Near the center of the scale, the two levers are located one above theother and connected by the link 5 which is provided with suitable agatebearings 6 and 7, which engage with the knife edges 8 and 9.

The counterweight is located on the lever u and is designated 10.Secured to this is a bracket 11 which has a connection 12 with a ribbone which runs over the eccentric. By this arrangement of the levers thecounterweight is placed at the extreme rear of the scale, even beyondthe connection with the eccentric. The scale housing from front to backis slightly lengthened to the rear of the usual upright Z), as clearlyindicated in Fig. 3, to accommodate this counterweight. Thecounterweight being located in this extreme position is at aconsiderable distance from the fulcrum and consequently has thenecessary moment to counterbalance the mechanism without being arelatively heavy member. However, counterweights used in connection withlevers of the first order are very unsatisfactory, for instead of having.a tendency to hold the knife edge against its fulcrum they havejust'the opposite tendency to lift it out, and we have found that theyare so unreliable as to be impractical without some means to correctthis fault. lVe correct the difiiculty by providing the knifeedgemember 1) with an upwardly directed knife edge as well as the downwardlydirected knife edge 0 These knife edges are, of course, directly inline, as is plainly shown in Fig. 4;. This upwardly directed *knife edgeo engages with the agate block '13,"supported in the clips 14.

(ill

This provides the counterweighted lever of the first order with a doubleknife edge fulcrum which easily holds it down, yet pro vides a minimumof friction.

It will be noticed that the platform supporting bars 72 have at theirrear ends the drop portions 15, which permits the plat-- form bars atthe rear ends to be suspended by links 16 from the lever 1. This forms afloating bearing at this point which together with the floating bearingformed by the link 5, Where the levers are connected, is all that isnecessary to permit the levers in the lever system to move in theirparticular arcs.

In a fan. scale it is desirable to increase the capacity. This weaccomplish in a simple way by simply throwing the double crank 16 (Fig.1). This is connected to a rock shaft 17 which passes into the scalehousing and there is fastened thereon a cam 18. This cam 18, (Fig. 5) isadapted to engage under the extra capacity lever 19, which is fulcrumedon the standard 20 in much the same way that modern check levers arefulcrumed, namely, by a pair of plates which are ground or cut toprovide suitable knife edges. This gives a line hearing which mustabsolutely line up with the double knife edge bearings already describedin connection with the main counterweighted lever. In order to get theseabsolutely in alignment the bearings must be adjustable. It will be seenthat the standard 20 is adjustable by means of the two screws 21 and 22and also the clips 14, which are adjustable by reason of the machinescrews 25 and the lock nuts 26.

The free end of this lever is counterweighted as at 27. A projecting capscrew 28 is provided with a V groove 29, which is adapted to fit overthe knife edge 30 formed on a loop 31, projecting from the maincounterweight. By simply throwing the double crank 16 down on one sideor the other, it is possible to operate the cam 18 to either'lift or letthe extra capacity lever down so that it either relieves the maincounterweight of the extra counterweight, or else adds the extracounterweight. By providing the double crank shaft arm arrangement, asshown in 16, the shift may always be made by pressing down, which is asmall convenience. The spring 100 locks the crank in the position shownin Fig. 1.

lVhat I claim is:

1. In a scale, a system of levers for supporting the platform comprisinga pair of inter-connected levers of the first order one of whichoperates a counterweight and is supported to rock on an open fulcrum,and means for preventing the action of the counterweight from shiftingthe lever fulcrum.

2. In a scale, a system of levers comprising a pair of inter-connectedlevers of the first order supported on open fulcrums and including adouble knife edge pivot and an upper and lower bearing therefor.

3. In a scale, a lever connected with a counterbalancing weight anddirectly supported on an open fulcrum, and means for preventing thelever from rising from said point of support on said fulcrum.

1. In a scale, a lever having a counterbalancing weight on one end andsupported by a knife edge in a V block, and means for pre venting theknife from jumping out of the bearing block, including a second knifeedge aligned with the first knife edge, and a V bearing above said knifeedge.

5. In a scale, a system of lovers including a counterweighted lever ofthe first order, having an open fulcrum support, a second bearingaligned with the first bearing and having its members inverted forpreventing the lever shifting in the first bearing, and an extracapacity lever having a fulcrum in line with the two first-mentionedbearings.

6. In a scale, a system of levers including the counterweighted lever ofthe first order, having on open fulcrum support, a second bearingaligned with the first bearing, and having its members inverted forpreventin the lever shifting in the first bearing, an an extra capacitylever having a fulcrum in line with the two first-mentioned bearings,two of said fulcrums and bearings being adjustable to line up with thethird.

7. In a scale, a system of levers, having in combination with aplatform, one relatively long lever of the first order for so portingone end of the platform and reac ing beyond the other end of theplatform for connection with an indicating device, and a relativelyshort lever of the first order having a floating bearing connection withsaid other end of the platform for suspending same and having its lengthconfined wholly within the extremities of the first mentioned lever,said levers being linked together at a. point between their fulcrums.

8. In a scale, asystem of levers, having in combination with a platformone relatively long lever of the first order for 'fulcrumin thereon theplatform at one end thereof and reaching beyond on the other end of theplatform, an indicating device connected with and operated by suchextended end of the said lever, and a relatively short lover of thefirst order with which said other end of the platform has a suspendedlink support, said second lever being contained wholly within theextremities of the first lever and being linked thereto adjacent thecenter of the platform.

9. In a scale, a system of levers including a counterweighted leverprovided with a loop having a knife edge, an extra capacity leverprovided with a capscrew with a groove adapted to be fitted over theknife edge of the loop, and means for dropping the same onto the knifeedge or lifting it from the knife edge.

10. In a scale, a lever system including a plurality of levers properlyfulcrumed and interconnected together, one of which has its resistancearm extending towards the outside of the scale, and is provided with theusual draft connection, and a counterweight located immediately next tosaid connection but further toward the outside of the scale.

12. In a scale, a plurality of levers of the first order fulcrumed andinterconnected together, one of which has on its extreme resistance enda counterweight end, also a draft {connection for the resistance membersof the scales.

18. In a scale, a lever system including a plurality of levers, an extracapacity weight, a housing in which said levers are shielded, and adouble arm crank for controlling the extra capacity Weight whereby thesame may be shifted in either Way by pressing down on the double armcrank.

14. In a scale, a plurality of levers, a housing for containing thesame, ity lever for shifting extra weight onto one of the levers, a rockshaft for controlling said extra capacity lever, and a double arm cranksupported on the rock shaft on the outside of the housing forcontrolling the extra capacity lever.

In testimony whereof I have aflixed my signature.

BERT W. KING.

an extra capac-

